ICD-10-PCS Code For None: Procedure Code Group Overview

The International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS) code group 6A4Z includes procedures performed to induce hypothermia using extracorporeal or systemic therapies. These ICD-10-PCS codes are used for inpatient documentation when extracorporeal lowering of body temperature is performed to manage patient physiology in clinical scenarios such as post-cardiac arrest care or intraoperative temperature control. Accurate coding within the ICD-10-PCS 6A4Z group is essential for proper inpatient reimbursement, as it captures the specialized extracorporeal procedure performed and supports clinical documentation accuracy.

Customize your policy alerts

Sign up for ICD-10-PCS Code For None: Procedure Code Group Overview policy alerts

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

None Hypothermia Procedure Overview

Procedures in this group involve extracorporeal lowering of body temperature using systemic circulation support to induce hypothermia. These therapies affect physiological systems rather than a specific anatomical organ or structure and are performed outside the body. Accurate ICD-10-PCS coding of these procedures ensures inpatient records reflect the use of extracorporeal hypothermia, which impacts case mix and reimbursement.

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
6	Section	Extracorporeal or Systemic Therapies
A	Body System	Physiological Systems
4	Operation	Hypothermia
Z	Body Part	None

Explore openpayer tools

View all tools

ICD-10-PCS Code For None: Procedure Code Group Overview

Customize your policy alerts

Sign up for ICD-10-PCS Code For None: Procedure Code Group Overview policy alerts

Get alerted when relevant policies change without checking for updates manually.

Monitor payer policy activity

Receive email alerts as soon as relevant payer policies are published or updated.

None Hypothermia Procedure Overview

Code Attributes

Character	ICD-10-PCS Category	Code Group Details
6	Section	Extracorporeal or Systemic Therapies
A	Body System	Physiological Systems
4	Operation	Hypothermia
Z	Body Part	None

When to Use

Use a code from this group when a patient receives extracorporeal lowering of body temperature as a therapeutic intervention during an inpatient stay. Typical indications include targeted temperature management after cardiac arrest or controlled intraoperative hypothermia where systemic extracorporeal methods are employed.

ICD-10-PCS Codes

2 rows

ICD-10-PCS Code	Description
6A4Z0ZZ	Hypothermia, Single
6A4Z1ZZ	Hypothermia, Multiple

Typical Clinical Scenarios

A middle-aged patient is admitted to the intensive care unit after out-of-hospital ventricular fibrillation cardiac arrest with return of spontaneous circulation but persistent coma. Targeted temperature management is initiated using an extracorporeal circuit to lower and maintain core body temperature to mitigate neurological injury. The procedure is systemic and does not target a specific organ. Typical codes: 6A4Z0ZZ
An adult undergoing complex aortic surgery is taken to the operating room for planned intraoperative systemic hypothermia to reduce metabolic demand and protect neurologic function during periods of circulatory interruption. An extracorporeal temperature-lowering therapy is instituted preemptively as part of the surgical strategy to control core temperature. Typical codes: 6A4Z0ZZ
An ICU patient who previously underwent single-session extracorporeal hypothermia for neuroprotection develops refractory fever and requires a subsequent extracorporeal lowering of body temperature session during the same hospitalization to control temperature and reduce metabolic stress. The repeat systemic hypothermia procedure is performed as an additional therapy. Typical codes: 6A4Z1ZZ

Related Codes

6A4T-URINARY-SYSTEM-HYPOTHERMIA

ICD-10-PCS Code For Urinary System: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Explore openpayer tools

View all tools

When to Use

ICD-10-PCS Codes

2 rows

ICD-10-PCS Code	Description
6A4Z0ZZ	Hypothermia, Single
6A4Z1ZZ	Hypothermia, Multiple

Typical Clinical Scenarios

A middle-aged patient is admitted to the intensive care unit after out-of-hospital ventricular fibrillation cardiac arrest with return of spontaneous circulation but persistent coma. Targeted temperature management is initiated using an extracorporeal circuit to lower and maintain core body temperature to mitigate neurological injury. The procedure is systemic and does not target a specific organ. Typical codes: 6A4Z0ZZ
An adult undergoing complex aortic surgery is taken to the operating room for planned intraoperative systemic hypothermia to reduce metabolic demand and protect neurologic function during periods of circulatory interruption. An extracorporeal temperature-lowering therapy is instituted preemptively as part of the surgical strategy to control core temperature. Typical codes: 6A4Z0ZZ
An ICU patient who previously underwent single-session extracorporeal hypothermia for neuroprotection develops refractory fever and requires a subsequent extracorporeal lowering of body temperature session during the same hospitalization to control temperature and reduce metabolic stress. The repeat systemic hypothermia procedure is performed as an additional therapy. Typical codes: 6A4Z1ZZ

Related Codes

6A4T-URINARY-SYSTEM-HYPOTHERMIA

ICD-10-PCS Code For Urinary System: Procedure Code Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-PCS Code For None: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For None: Procedure Code Group Overview policy alerts

None Hypothermia Procedure Overview

Code Attributes

ICD-10-PCS Code For None: Procedure Code Group Overview

Sign up for ICD-10-PCS Code For None: Procedure Code Group Overview policy alerts

None Hypothermia Procedure Overview

Code Attributes

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are represented in ICD-10-PCS code group 6A4Z?

What are the specific ICD-10-PCS codes in the 6A4Z group?

In what clinical scenarios would 6A4Z procedures be documented for inpatient coding?

Under which ICD-10-PCS section and operation are 6A4Z codes classified?

How does accurate coding of 6A4Z procedures affect inpatient records and reimbursement?

References

When to Use

ICD-10-PCS Codes

Typical Clinical Scenarios

Related Codes

Which procedures are represented in ICD-10-PCS code group 6A4Z?

What are the specific ICD-10-PCS codes in the 6A4Z group?

In what clinical scenarios would 6A4Z procedures be documented for inpatient coding?

Under which ICD-10-PCS section and operation are 6A4Z codes classified?

How does accurate coding of 6A4Z procedures affect inpatient records and reimbursement?

References